google app engine - What are the characters appearing at the end of my appengine URL -

i have appengine python application. includes simpleauth library. viewing application in google chrome.

after load page in application, text looks (for example) "#.uhjcz2twka4" appended end of url.

what , come from?

upon edit, maybe it's 1 of javascript includes doing it. here javascript includes:

<script type="text/javascript" src="/static/js/tinymce/tiny_mce.js"></script> 

<script type="text/javascript" src="//use.typekit.net/dvk0ttp.js"></script> <script type="text/javascript">try{typekit.load();}catch(e){}</script> <script type="text/javascript" src="//api.filepicker.io/v1/filepicker.js"></script> <script src="/static/js/bootstrap.min.js"></script> 

thanks in advance,

aaron

looks you're using addthis apis , have enabled address bar tracking appends "strange" characters page url.

those parameters used collect data if copies url somewhere else

if don't want feature, can disable it, editing javascript config variable apis (see attached link tutorial)

data_track_addressbar = false; 

source: addthis support